Molding machine



` lJuly 14, 1936. J. J. LAwLoR MOLDING MACHINE Fild Dec. 14, '1933 2 Sheets-Sheet l 'f INVENTOR. dwf/v d. Am/0H July 14,1936.

'J. J. LAWLOR MOLDING MGHINE.

2 Sheets-Sheet 2 Filed DeC. 14, 1933 l MAI IN V EN TOR. f JoH/v ma 0f? ATTORNEY.

Patented July jV 14, 1936 n Y Jiivrtinlniv'd MAC-nina.

i John J. LawlonPlainfleld; J.. assigner to Gen- Y eral Foundry Machinery(Jorporation,V a cor-` l `poration of `Delaware Application December 14, 1933,` serial N. 702,275

\ 13 claims. (onza-zn Y The presentinventin relatest improvements in mold making machinery. ,v

The invention is moreparticularly adapted for making a plurality of molds from `the same pattern andithas for anobject to provideV a continuousv system of. mold manufacture, wherein each moldundergoes acycle of operations, but in' which the operations are'simultaneously carried j out on differentmolds.

A more speciiicfobject of the inventionA is to v provide amachine in which the assembly of a mold," the jarring and ramming of sand in the mold, andthe stripping of the mold fromlthe pati tern" are preformed at different stationawhile a conveyor .carries a series of moldfparts succes-` sively througlisaid stations. Infa preferred ernbodiment fofumy invention the conveyor has the formfof a turntable which is operable by hand to convey the mold parts from station to station.4 With these objects `in view and others which will appear hereinafter I shall now describe a preferredembodiment of my invention and thereafter the novelty ardlscope of the invention will be pointedfout in theclaims. i l In thelaccompanying drawings: v Fig.` 1 "is a plan viewof `myimproved molding machine; v t

Fig, 2 is afragmental view in vertical section taken on theline 2-2 of .Fig` 1; .Y v s v 3 v Eig. 3'is a detail view in verticalV section taken substantially onthe line 33 of Fig..1; v v v Fig. 1- is a view in section takenon the `line 4-54 of 1ig.2,.being substantially a plan View of the stripper mechanismand i. g- Fig. 5 is a fragmental view in section taken on theline 5--5 of Fig. 1. v,

Ingeneral my improved molding machine cornprises a jarring mechanism anda stripping mech-` anisrn` located in predetermined 4spaced relation, with a common conveyor serving both of these mechanisms. The jarring mechanism shown in the drawings comprises a main frame IIJ from which rises a trunk II. AA jarring head I2 carried Y by a plunger I3 is tted to slide in a bore or work:

4 ing chamber I4 formed inthe trunk. `Guide pins I5 extend downwardly fromv'the head `I2 into suitable sockets formed in the trunk, to keep the head I2. from turning, .By'm means of` suitable` valve mechanism `ci? `standard form `(not shown) 50 a pulsating airpressure is produced in the'zlialn-V ber I4 so asto cause the head I2.to.reciprocate vertically. f f

Adjacent the 'trunk ,there is` a clumn 1s.

which rises from the base I0. Pivotally'mounted 5 on this column is an arm Il which ovcrlles the vided with a pair of vertical end flanges I2a Ajarring head I2. 1 Projecting Ythrough a vertical opening in the outer end ofthe arm is the stem I8 of a rammer I9. Pivotally mounted on the end of the arm I I is a yoke 20 formed-With camshaped wings 2I adapted to engage a pin 22 5 which is inserted through one'of a series of opening-s 23 formed in thee stem I8. A handle 24 is secured tothe .yokeZIL The rammeris adapted 'to `rest on the sand in a ask section while the jarring head I2 is operating, and the pin 22 is 10 set in s uch position that by swinging the handle 24 to the horizontal position shown in Fig.'2, the cams 2l will liftthe rammer clear of the work.

A rotary conveyor table is mounted to turn on a frame whichncomprises a pair ofV concentric annular.V beams 21 `and 28` of channel section. I hese beams are supported on `pedestals 29, there being three of these pedestals used in the par-` ticular embodiment illustrated. Rollers 3U Vare disposed radially in these channels, having jour-V 2 nals 3I which turn in slots formed in the flanges ofthe channel beams. l l f The table itself which isgenerally indicated by the reference numeral 33, is provided with a pair of annularconcentric rails 34..and 35 which run 25 on therollers 30. Each pedestal-is provided with a bracket 31 Vin which Avertical vrollers 38 are mounted.` `Theserollers` bear against the outer periphery of the rail 34, thereby confiningv theV table against lateral dispersement. v 'I'he top `of thetable 33 has.a circular outer periphery preferably coinciding with that of the outer rail 34. For the purpose of reducing weight a large square opening 40 is formed at the center of the table. The table top is subdivided into 35 eightlsections, comprising fourmain plates 4I whichare of substantially rectangular form except Li'or their outer arcuate margins, and fourY sector-shaped plates 42 which ll in the corners between the main plates 4I. The plates 42 are 40 Y fixed to and connect the rails 34 and 35 buty the plates 4I areA adapted to reciprocate vertically.

Iny order to guide the plates 4I in their Vertical reciprocation, pins 43 project from the plates 42 and enter holes in lugs 44 projecting laterally from the plates 4 I. Normally the lugs are seated in recesses formed in the plates 42 so that they will lie iiush with the surface of the table top.. Asshown in Fig. 3, the jarring head I2 is prowhich pass between the rails 34 and 35, to contact with the plates 4I duringlthe jarring operation` v j v Y Each` plate 4I is adapted to carry a pattern plate and a flask section over the jarring head 2 and under the rammer I9. To this end each plate 4| is provided with a centering pin 46 adapted to enter a central socket in the bottom of the pattern plate. Preferably a slightly different pattern plate is used for the cope from that used for the drag. The difference lies in the fact that the drag pattern plate 41 has apertures 48 near opposite ends thereof, whereas the cope pattern plate 49 has dowel pins 50 near opposite ends thereof, these pins projecting from the opposite faces of the plate. The drag section 5| of the flask is provided with lugs 52 at each end formed with depending dowel pins 53 which are adapted to pass through the apertures 48 of the drag pattern plate and project into slots 54 in the table plates 4| Y also extended into the plates 42, as indicated at 54a, so as to accommodate pattern plates and flask sections of larger sizes. It will now be evident that with the center pin 46 engaging the drag pattern plate and the pins 53 doweling the drag to the drag pattern plate and also engaging the slots 54 the mold parts will be ilxed against any lateral displacement and may therefore be brought to proper position with relation to the jarring mechanism. The cope section 55 of the flask alsov has projecting lugs 56 at each end, but these lugs are formed with holes to receive the pins 50 projecting from"the cope pattern plate 49. 'I'he cope parts are properly centered on the table plates 4| because, as shown in Fig. 3, the pins 50 project downwardly and engage the slots 54 or 54a, as the case may be.

Disposed at an angle of 90 degrees from the janing mechanism is stripper mechanism 58, so that while one flask section isv centered over the jarringhead, as indicated in Fig. 1, the next ilask section to the right will be centered over the stripper. The latter has a vertically slidable stripper head 59 from which project pins 60. These pins are adjustable ln slots 6| formed in the stripper head. By means of suitable mechanism, the details of which are not shown because they correspond to standard practice, the stripper head 59 may be raised upon depressing a pedal 62. The pins 60 then pass through slots 63 in the table plates 4| and also through openings 64 formed in the pattern plates to engage the end walls of the flask section and lift the same off the pattern. If necessary to accommodate larger molds the slots 63 may also be extended into the table plates 42, as indicated at 63a.

The operation of the machine may now be described as follows: Referring to Fig. .1, it will benoted that there are four operating stations indicated by the letters A, B, C, and D. Every other plate 4| bears adrag pattern plate 41 while intervening plates 4| bear cope pattern plates l49.

As illustrated in Fig. 1, there is a cope patternV plate 49 at station at station B. 'An drag section of a A and a drag pattern plate 41 operator at station B places a flask over the pattern plate 41 with the pins 53 of the drag section passing through the holes 48 in the pattern plate and engaging the slots 54 in the plates 4|, or, if the mold is too long to be accommodated within the confines of the plate 4| said pins will project into the slot extension 54a of the adjacent plates 42. After the flaskA section has been properly positioned on the pattern plate, it is fllled with sand and then the table is turned manually through an angle of 90 degrees to bring the illled flask section to the station C. The handle 24 is now operated to drop the rammer I9 upon the These slots are sand in the flask and then the jarring mechanism is operated to reciprocate the jarring head i2 vertically and thereby jar the flask. During this operation, the rammer I9 is jarred with the flask and by reason of its inertia it tends to ram and pack the sand tightly in the flask. As soon as the jarring operation is completed the rammer is raised clear of the work and the table is then turned through another angle of 90 degrees to bring the flask section over the stripper 58. Here surplus sand is struck off the drag and a bottom board is clamped thereon in the usual manner, after which the pedal 62 is operated to lift the drag section off the pattern. 'I'hen the operator removes the drag, inverts it, and places Vit on a suitable adjacent table (not shown). In

the meantime, the cope pattern plate 49 has been carried progressively from station A to station B 'and then to station C. At station B a cope flask section was lltted upon the plate 49 with the pins 5U projecting through the apertured lugs 56,v and the cope was lled with sand. While the stripper was being operated to strip the drag from the pattern, the cope section was being jarred. When the table is moved through the next step of 90 degrees, the cope section is centered over the stripper. Here the pouring gates are formed in the mold and the pedal 62 is then operated to lift the cope 'oil' its pattern plate, after which 'the cope. Thus, the work proceeds, with a mold section being stripped while the next succeeding section is being rammed or jarred and while the second succeeding section is being assembled and filled. If desired, assembly ofthe mold sections may take place not only at station B but also at station A, or, if desired, the sections may all be assembled at station A and illled with sand at station B.

The rammer arm |1 normally occupies the position shown in full lines in Fig. 1, but whenever necessary it may be swung clear of the table to the position shown by broken lines. A spring latch 65 is provided for holding the-rammer arm,

comprising a vertically reciprocable head, atablev mounted to rotate over said head and having a series of individually reciprccable portlonsf'adapt- 'f ed to be reciprocated by the head, each portion serving to support a mold-to be jarred :and ya rammer adapted to press againstr the mold `being' jarred. j l' 1.

2. In a molding machine`a` jarring ,mechanism comprising a vertically reciprocable head', a circular table mounted to rotate over saldhead and having a series of individually reciprocable secy tions. adapted to be reciprocated by the'head,

each section serving vto support a mold to be jarred, a rammer head adapted torest'on the mold during the jarring operation, and means operable at will for withdrawing the rammer head from the mold.

3, In a molding machine, a jarringmechanism comprising avertically reciprocable'h d, aconveyor'adapted to travel over said head a d having a series of individually reciprocable adapted to be reciprocated by the head, eac portion serving to support a moldto be jarr` rammer head adapted to rest on the mold during the jarring operation, and means operable 1 at will for withdrawing the rammer head from the mold.

` 4. In a molding machine, a jarring mechanism comprising a reciprocable jarring head, a conveyor movable over the head, plates carried by the conveyor and individuallyreciprocable thereon by the jarring head, each plate serving as a support for a pattern and a flask section, and means for retaining the'pattern and flask section against lateral displacement during the jarring operation. y Y

y 5. In a molding machine, a Ajarring mechanism comprising a reciprocable jarring head, a

conveyor over the head, plates carried by the ,conveyor and individually reciprocable 4thereon by the jarring head, each plate serving asa supi port for a pattern and a flask section, means for guiding each plate in its .reciprocating movement, and means for retaining thepattern plate and flask against lateral displacement on the plate while permitting vertical movement with 'respect to the plate. i t

6. Ina molding machine, a jarring mechanism comprising a reciprocable jarring Ihead, a*y conveyor movable over the head, platesy carried by the conveyor andindividually reciprocablethereon by the jarring head, apattern plate for a flask sectionfeach` pattern plate having a centering the conveyor and individually reciprocable `thereon by the jarring head, a pattern plate, a flask section. overlying the `pattern plate, the latter having acentering` socket,` a centering pin on each i conveyor plate adapted to engage such socket, each conveyor plate being also formed with slots, and pins carriedby the flask and passing through the pattern plate into such slots.

8. In a molding machine, a jarring mechanism,

`a stripper, and a rotary table adapted to carry a series of molds sequentiallyV to the jarring mechanism and thence over the stripper, said table having plates on `which the molds arev supported, the plates being adapted for vertical reciprocation by the jarring mechanism and being also formed with slots underthe mold, the stripper being formed With'pins adapted to be projectedthrough said slots to strip the mold.

` 9. In a'molding machine, a jarring mechanism,

a stripper, and a conveyor for carrying a series of molds sequentially to the jarring mechanism and thence over the stripper, said conveyor'having plates on which the molds are supported, the plates being adapted for vertical reciprocation by the jarring mechanism and being also formed with slots under the mold, the stripper being formed with pins adapted to be projected through said slots to strip the mold.

10. In a molding machine, a jarring mechanism, a stripper, a rotary table adapted to carry molds from the jarring mechanism to lthe stripper, and means onthe table for positioning the molds at predetermined angular spacing thereon, `the `jarring mechanism and stripper being so relatively positioned that while one mold is in position to be stripped by the stripper the succeeding mold. on the table `will be in position to be jarred by the jarring mechanism. Y

1v1. In a molding machine, a jarring mechahead, a stripper having vertically movable stripping pins, a circular table mounted to rotate over the head and stripping pins, said table having vertically movable plates individually reciprocable by the jarring `head and adapted to vsupport molds,` the plates being also slotted Wherebythe stripper pins may pass through the table tostrip the molds, thejarring mechanism and stripper being so relatively disposed that one mold maybe stripped while another is being jarred. i

12. In a molding machine, a conveyor, a series of pattern plates mountedV thereon at uniform spacing alongthe conveyor, the latter being movable to carry the plates step by step through a series of stations of corresponding spacing, ra jarring and rammingmechanism at one of the stations, and a stripper at a succeeding station, wherein a flask section may be flted upon each pattern as it stops at a station preceding the jarring station and the flask section be filled with sand, and simultaneously a pattern with its sand filled flask section at the jarring station may `be jarred to pack and ram the mold, while at the same time the mold at the stripper station may be stripped from its pattern and be` removed from the conveyor.

13.' In a` molding machine, a rotary table provided with a series of reciprocable sections disposed at uniform angular"` spacing, Ia pattern plate mounted on each section, the table being movable to carry the plates step by step through a cycle `of stations of angular spacing, a jarring mechanism at one of the stations, and 'a stripper at a succeeding station, whereby a flask section may be fitted upon each `pattern as it stops at a Astation preceding the jarring station and the ilask section be lled with sand, and simultaneously a pattern and sand filled ask section at the jarring station may be jarred, while at the same time the mold atthe stripper station may be stripped from its pattern and removed from the table.

'JOHN J. LAWLoR.

20 nism having a vertically reciprocable jarring 

